<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
    <script src="vue.js"></script>
  </head>
  <body>
    <div id="root">
      <div ref="hello" @click="handleClick">
        hello world
      </div>
    </div>

    <script>
      new Vue({
        el: '#root',
        methods: {
          handleClick: function() {
            //his.$refs.hello 获取document
            alert(this.$refs.hello.innerHTML);
          }
        }
      });
    </script>
  </body>
</html>
